Just got this..
java.lang.ClassNotFoundException: java/util/LinkedHashMap$KeyIterator
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:258)
at org.netbeans.lib.profiler.server.ProfilerInterface$InitiateProfilingThread.initiateInstrumentation(ProfilerInterface.java:174)
at org.netbeans.lib.profiler.server.ProfilerInterface$InitiateProfilingThread.run(ProfilerInterface.java:136)

Integrated into 'releases/release74', will be available in build *201311141216* or newer. Wait for official and publicly available build.
Changeset: http://hg.netbeans.org/releases/rev/7a6dcb4deada
User: Tomas Hurka <thurka@netbeans.org>
Log: bugfix #236890, load LinkedHashMap inner classes via public API
(transplanted from 2ab9ee6ec5a0c0f7f4edfab0152405f580836c57)